JayHorton54 wrote:
What I want is to have imported text from Word or Markdown take on the appearance of a Pages stylesheet.
If you are thinking that Pages uses a stylesheet, as would HTML5 apply a CSS3 styling to automatically style opened content, then you can forget about that notion. Pages cannot open Markdown, nor even consume plain text, and magically transform it into styled content. On the otherhand, Pandoc can convert your Markdown into HTML5, and allow you to import a stylesheet of your making to produce a web page that can appear like your Markdown.
Pages is a word processing application and when it opens a Word document, it attempts to translate that content, including inherent styles, into the Pages internal document (.pages) format. There is no assurance that the internal Pages document will be 100% faithful to the original Word document appearance, nor do you have any control over any of the available Pages templates during translation.
Based on your original goal, Pages is not the tool you thought it was and you cannot directly, or indirectly (Pandoc) get Pages to automatically style your Markdown content. Wrong tool.